WMOD00301 ‎(2)‎

• Title: Conceptual Plan to Develop Water Augmentation by Weather Modification in the Colorado River
• Date: 5/14/1979
• Weather Modification - Doc Type: Report

ORA F T

the most important and desirable result is to increase precipitation
and subsequent runoff, evaluation efforts will concentrate on those
areas which measure and document the changes in precipitation,
specifically the statistical and physical analyses.

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The statistical evaluation, which is designed to document the results
of the experiment, must address a number of issues; experimental
design, avoidance of bias, statistical techniques, and others. In
previous experiments involving fixed target areas, the design has
employed single area, target-control, and crossover techniques. The
choice of design depends upon the area involved, the type of clouds
encountered within the area, and the experimental unit selected. To
avoid or minimize bias it is essential that randomization be used. A
number' of methods have been employed, all involving measurements of
an experimental unit (cloud, storm, day, 12-hour period, etc.), and a
comparison of the treated and untreated units. To minimize the time
required to achieve statistical significance the number of treated
and untreated units should be about the same, i.e., 50/50 randomization.

Since the response of the experimental unit to treatment can manifest
itself in a number of simultaneously occurring ways (changes in cloud
area, updraft speed, water and ice concentrations, and numerous
others) the statistical techniques employed must be capable of
incorporating these responses into a single test of significance. It

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